Various fixes in the game include a graphics and sound upgrade, as well as the removal of several known glitches that had been found in the original pair. Like its paired predecessors, it was never truly released outside of Japan; however, while Red and Green provided the wild Pokémon and game-exclusive Pokémon lists for the rest of the world's Pokémon Red and Blue, Blue provided the graphics, game engine, and script for translation.

Again, the evil Team Rocket is causing chaos across the region, and it is up to the player to defeat them.

Changes from Red and Green

Kanto is aesthetically redesigned, with the design of doors, signposts and other tilesets redesigned. Cerulean Cave, the game's final dungeon, receives the most significant overhaul, sporting a completely different layout. These designs would later be reused for the international Pokémon Red and Blue. Indigo Plateau remains unaltered.

All Pokémon have new front sprites but retain the same back sprites from Red and Green. Trainers and the literal Ghost have the same sprites from Red and Green. The sprites from Blue would later be used in the international Pokémon Red and Blue.

The introduction of the game features a battle between a Gengar and a Jigglypuff, as opposed to a Gengar and a Nidorino, as it was in Pokémon Red and Green. This change carried on into the localized version of Pokémon Blue, while the original appeared in the localized Pokémon Red.

The places where some Pokémon are obtainable was changed:

Jynx and Lickitung, only available through in-game trades in Red and Green, are now found in the wild.

A glitch that allows the player to surf from the top of a cliff was removed.

A glitch where the game mistakenly believes the player has beaten Sabrina (when they actually lost to her) was removed.

MissingNo. was given the placeholder Pokédex entry コメント さくせいちゅう Comment to be written. and became the ??? species. This was not translated, resulting in a glitched Pokédex entry in the localized Pokémon Red and Blue and the corruption of MissingNo.'s original height and weight (1.0 m (3.3 ft) and 10.0 kg (22.1 lb), respectively), showing instead a height of 10.0 ft (3.1 m) and a weight of 3507.2 lb (1590.8 kg).[3]

Elite Four

Pokémon

Blue did not introduce any new Pokémon, and so the 151 present in Red and Green are the only ones obtainable. Like Red and Green, some Pokémon are missing from Blue and must be traded from another game to complete the Pokédex or evolved from less powerful forms.

The following Pokémon are not obtainable in Pokémon Blue. In order to obtain any of the below Pokémon, they must be traded from one of the paired versions of Generation I, or from Generation II. The table below indicates which paired Generation I game has that Pokémon available.

Connectivity

Like in Red and Green, players may trade Pokémon between two cartridges using a Game BoyGame Link Cable. To take full advantage of this feature, several Pokémon are exclusive to each game of the pair, making it required that a person trade with others in order to complete their Pokédex. The Game Link Cable also makes possible battles with another player, allowing one to pit their Pokémon against new challenges. The game can trade and battle with Japanese versions of Pokémon Red, Green, Blue and Pokémon Yellow. It can also trade with Japanese versions of Pokémon Gold, Silver, and Crystal via the Time Capsule. Pokémon Blue is completely incompatible with games from Generation III onward.

Trades between Pokémon games in different languages are possible in this generation; however, a Japanese game cannot connect with a non-Japanese game. The latter will always result in corruption if attempted. This is due to the fact that the games cannot automatically translate the Pokémon data from Japanese to a different language or vice versa, since there is not enough room on either cartridge for all of the text, namely kana and the Latin alphabet (a feature that later became possible). If a battle between a Japanese game and a non-Japanese game is attempted, the battle simply does not work, with the save files left unharmed.

Virtual Console

Japanese and non-Japanese Generation I core series games do not recognize each other when attempting to link them via 3DS wireless communication, where they can then be sent to Pokémon Sun and Moon.

Differences in the Virtual Console release

This article is incomplete.Please feel free to edit this article to add missing information and complete it. Reason: Complete list of moves with revised animations.

The Nintendo 3DS Virtual Console release can communicate with other Virtual Console versions via Nintendo 3DS wireless communication, simulating the Game Link Cable. In the games, this is accessed from a menu on the touch screen.

The old man who trades the player an Electrode on Cinnabar Island claims that the Raichu he received "went and evolved". As Raichu does not have an evolved form, this makes no sense whatsoever. In the context of Pokémon Blue, it makes sense as the player trades away a Kadabra, which evolves through trade, for a Graveler.